Scribing trammel for straight and curved lines



July 23, 1940;

P. MANTHEY SCRIBING TRAMMEL FOR STRAIGHT AND CURVED LINES Filed May 5, 1939' .YN N aria Patented July 23, 1940 SCRIBING TRAlVEMIEL FOR STRAIGHT AND CURVED LINES Paul Manthey, Bronx, N. Y.

Application May 6, 1939, Serial No. 272,086

1 Claim.

, tion, parallel lines or circles may be drawn or scribed accuratelyupon the flat surfaces of an object.

One of the objects of the invention is to provide a bar of indefinite length with standard graduations on one of its sides and accurately spaced indentations on the adjacent top side, and a point carrying head slidable on the bar.

Another object is the provision of means whereby a slidable head, having a locking pin engageable in the spaced indentations of the bar, may be quickly and accurately moved throughout the length of the bar.

These and other advantageous objects are attained by the novel construction and arrangement of parts hereinafter described and shown in the accompanying drawing, constituting a material component of this disclosure, and in which:

Figure 1 is a side elevational view of an embodiment of the invention, partially in section, showing details of construction.

Figure 2 is a top plan view of the same.

Figure 3 is a fragmentary sectional View taken on line 3-3 of Figure 1.

Figure 4 is a cross sectional view of the graduated bar showing the spaced indentations therein.

Referring to the drawing in greater detail, the numeral i8 designates a rectangular bar having engraved on its front face graduations ll representing inches, each subdivided into sixteen equal parts.

It will be seen that these graduations, beginning at zero do not start from the extreme left hand end of the bar, a space being left blank, for reasons that will become apparent as the description continues.

As shown this bar is graduated a distance of 24 from zero, but may be of greater or less length as desired; at the right of the last graduation, is a blank space.

On the upper, adjacent side of the bar II] are provided a longitudinal row of conical indenta- 'tions 52, accurately spaced and in line with each graduation on the bar I0.

At the left hand end of the bar is a transverse annular opening adapted to adjustably receive a scriber l3, vertically slidable therein, and a I clamp screw M in its end for holding the scriber in adjusted position; for convenience in making adjustment, a knurled knob l5 scriber.

slidable on the bar is a head I6, having a rectangular opening longitudinally therethrough, the head comprising a substantially elongated rectangular block of metal, reduced in width at one end, as at I1, the wide portion having concaved sides l8 forming finger grips to facilitate it moving along the bar.

In the reduced portion ll of the head is an opening forming a bearing for a detent locking pin I9, having a pointed end 20 adapted forengagement with indentation l2 formed in the graduated bar I0; concentric with the pin hearing is a spring casing 2| threadably secured in the head element I1. The locking pin l9 extends upwardly through a disc 22 engaged in the upper interior portion of the spring casing 2 I, providing a guide bearing for the locking pin.

To hold the head H6 in adjusted position, the locking pin 19 is held in downward position by a spring 23, acting between the disc 22 and a collar 24 fixed on the pin.

When it is desired to change the setting of the head, the locking pin I9 must be raised from engagement with the indentations l2 of the bar I0. This is accomplished by depressing a lever 25, pivoted in a slotted stud 26, secured in the head near the spring casing 2|,

The lever 25 has at one end a forked element 27, adapted to receive the locking pin l9 and engage the locking pin head 28 when raised by the downward movement of the lever handle 29.

Aligned with the locking pin I9 is a cylindrical roll 30, rotatably held by a shouldered screw 3|, threadably engaged on the under side of the slidable head l6.

Near the right hand end of the head, are screw threaded openings 32 and 33, in vertical alignment, the upper opening 32 being receptive of a threaded rod 34 having near its upper end a groove adapted to receive a pin 35, fixed in the hub of a revolvable handle knob 36.

In the lower opening 33 of the block is removably secured a pointed scriber 31 in registration with the rod 34.

Cut through the front wall of the block I! is a bevelled recess 38, best shown in Figure 3, its inner edge being adjacent the graduated face of the bar H] and terminates in a knife-like edge which, when the locking pin 2!] is seated in any of the indentations l2 of the bar I0, provides a reading line coincident with and parallel to the graduations on the bar.

It will be understood that the slide head [6 may is fixed on the be moved to the left, as shown by dotted outline in Figure 1, or extended to the right when itis desired to use the extreme graduated length of the bar. 1

When it is desired to scribe a line parallel to an edge, at a distance of 3" from the edge as an example, the head I6 is moved into a position'where the indicating line 38 of the slide I6 coincides with the 3' mark on the graduated bar; the headwill be automatically locked in position when the locking lever 25 is released.

In use, the roll 30 is held in contact with the edge of the work and the instrument moved in a direction parallel to the edge.v Thescriber l3 may be raised or lowered, if necessary, to keep 2 ct f may be observed.

scriber point 31, which is 2", and obtain a dimension of 3" which is the correct setting of the 7 head as shown in Figure 1.

Although the foregoing is descriptive of the best known embodiment of the invention, minor changes may be made within the concept of th claim hereto appended. I

Having thus described the invention, what is claimed as new, and is desired to secure by Leti ters Patent, is: i

A marking implement comprising a bar of square cross section throughout its entire length, said bar bearing graduations on one side and vhaving a central rowof sharply defined conical indentations in a side adjacent the graduations and spaced apart in conformity therewith, a

scriber adjustably engaged in one end of said bar,

a head slidableon said bar, a spring pressed pin in said, head having a point selectively engageablein said indentations, lever means to retract said pin, and a single roller journalled on the opposite side of said head from said pin and in axial register therewith, said head having a bevelled lateral recess through which said graduation PAUL MANTHEY. 

